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Descripción
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| Intermediate band solar cells (IBSCs) are conceptually devised to increase the efficiency of solar cells by absorbing below bandgap energy photons at the time they preserve the cell output voltage. The absorption of below bandgap energy photons is carried out thanks to the existence of an electronic band -the so called intermediate bandwithin the semiconductor bandgap. This work reviews our present understanding of the concept covering essential topics such as the inhibition of the non-radiative recombination rate, the existence of intermediate band materials and the review of the experimental results obtained so far when the concept is implemented in practice by means of quantum dots. The inhibition of the non-radiative recombination that deep centres typically introduce in semiconductors is proposed to be achieved when the density of impurities is sufficiently high as the wavefunction of the electrons in these states transits from being localised to delocalised. On the other hand, the existence of these deep centres, introduced by certain impurities, also give the clue to propose intermediate band material candidates. Quantum dots have been used to take the intermediate band concept to practice and actual solar cells have already been manufactured. These cells, although have not exceeded the efficiency of their single gap counterparts, have proven useful to demonstrate the basic principles of operation of the IBSC. | |
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Internacional
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Si |
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Entidad
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Lugar
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Sydney Convention and Exhibition Centre, Australia |
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Referencia/URL
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9-999-9999-99 |
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Tipo de publicación
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Otras conferencias |